Hydrodynamic-hydrostatic pressure combined face seal device

Abstract

A hydrodynamic and hydrostatic combined end sealing arrangement is provided, which comprises a fixed ring that can be fixedly connected with the fixed part of a sealed part and a movable ring that can rotate with the rotator unit. Wherein, on the seal ends opposite to the fixed and movable ring, three adjacently arranged co-central circular end sealing areas are arranged respectively in sequence from outer to inner correspondingly. The outside in radial direction is a convergent clearance hydrostatic seal ring area that can form outside opening between the corresponding places at the two sides of the sealing arrangement, the middle is a hydrodynamic seal ring area for which a fluid hydrodynamic shallow groove on the end plane is provided, the inside is a circular area for the sealing dam with circular plane. The sealing arrangement combines hydrodynamic with hydrostatic end sealing, solves such problems as difficult to start a hydrostatic seal, end contacting due to high pressure fluctuation, and sealing failure, etc. by the action of hydrodynamic fluid, and can fully maintain the advantages with a fluid hydrostatic seal such as the high clearance and the control over the temperature rise of fluid, and realizes in a reasonable way the complementation of hydrodynamic and hydrostatic sealing and high reliability in controlling the fluid thickness at the end fluid film.

Description

technical field [0001] The invention relates to an end face sealing device of rotating equipment, which is suitable for the end face sealing of the rotating shafts of various types of compressors, reaction kettles, pumps and other fluid machines, especially the rotating shafts of large vertical equipment. Background technique [0002] Modern enterprises are interested in rotating equipment, such as various types of compressors, reactors, pumps and other fluid machinery, especially large vertical equipment, such as important pumps and / or equipment such as main pumps in nuclear power plants that require long seal life and high reliability. The requirements for service life are constantly increasing, and the requirements for reliability are also gradually increasing. Higher demands are therefore placed on the seal, one of the vulnerable parts of these devices. For this reason, hydrostatic sealing and hydrodynamic sealing technologies with higher technical requirements have eme...

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Problems solved by technology

[0006] In view of the above situation, the present invention will provide a new end face sealing device that can break through the traditional single dynamic pressure seal and static pressure seal, that is, the combination of dynamic and static pressure, which can satisfactorily solve the problems existing in the current single form of static pressure seal and dynamic pressure seal. The above-mentioned problems have realized the reasonable complementarity of the dynamic and static pressure sealing effect and advantages

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